Is the code at (and around) line 130 of .../SOAP/WSDL/Base.pm of no help to you?

I don't have that module installed but looking at SOAP::WSDL::Base source code on CPAN, I see warn "your reported warning"; at line 130 (with a comment just before it with an explanation):

        ...
        # check for namespae-qualified attributes.
        # neither XML Schema, nor WSDL1.1, nor the SOAP binding allow
        # namespace-qualified attribute names
        my ($ns, $localname) = split /\|/, $value->{ Name };
        if ($ns) {
            warn "found unrecognised attribute \{$ns}$localname (ignor
+ed)";
            next;
        }
        ...
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